export function errMsg(errCode: string | number, msg?: string | null) {
    if (process.env.SYSTEM_PRODUCTION)
        return (
            (msg || "") +
            " (SystemJS https://github.com/systemjs/systemjs/blob/main/docs/errors.md#" +
            errCode +
            ")"
        );
    else
        return (
            (msg || "") +
            " (SystemJS Error#" +
            errCode +
            " " +
            "https://github.com/systemjs/systemjs/blob/main/docs/errors.md#" +
            errCode +
            ")"
        );
}
